Question1a person doing a chin-up weighs 725 n disregarding, Ask an Expert

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Question1

A person doing a chin-up weighs 725 N, disregarding the weight of the arms. Throughout the first 20.0 cm of the lift, each arm exerts an upward force of 371 N on the torso. If the upward movement starts from rest, what is the person's speed at this point?

Question2

The least possible note on a grand piano has a frequency of 27.5 {rm Hz}. The entire string is 2.00 {rm m} long and has a mass of 400 {rm g}. The vibrating section of the string is 1.90 {rm m} long. What tension is necessary to tune this string properly?

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